/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.operator.aggregation;

import com.facebook.presto.common.block.Block;
import com.facebook.presto.common.type.StandardTypes;
import com.google.common.collect.ImmutableList;
import org.testng.annotations.Test;

import java.util.List;

import static com.facebook.presto.block.BlockAssertions.createDoubleSequenceBlock;

public abstract class AbstractTestDoubleRegrAggregationFunction
        extends AbstractTestAggregationFunction
{
    @Override
    public Block[] getSequenceBlocks(int start, int length)
    {
        return new Block[] {createDoubleSequenceBlock(start, start + length), createDoubleSequenceBlock(start + 2, start + 2 + length)};
    }

    @Override
    protected List<String> getFunctionParameterTypes()
    {
        return ImmutableList.of(StandardTypes.DOUBLE, StandardTypes.DOUBLE);
    }

    @Test
    public void testSinglePosition()
    {
        testAggregation(getExpectedValue(0, 2), getSequenceBlocks(0, 2));
    }

    @Test
    public void testNonTrivialResult()
    {
        testNonTrivialAggregation(new Double[] {1.0, 2.0, 3.0, 4.0, 5.0}, new Double[] {1.0, 4.0, 9.0, 16.0, 25.0});
        testNonTrivialAggregation(new Double[] {1.0, 4.0, 9.0, 16.0, 25.0}, new Double[] {1.0, 2.0, 3.0, 4.0, 5.0});
    }

    protected abstract void testNonTrivialAggregation(Double[] y, Double[] x);
}
